The best advice I can give you is to develop a deck theme. It seems like your current deck is just a bunch of white and black cards from the current set. If you can find cards that do similar things or help each other do better things, you can make an effective deck.
You generally want multiple copies of a card in your deck, if you want to draw a card in your opening hand as frequently as possible, make sure to include four copies of that card. If you ant to draw a card at least once every game, make sure to include three copies of that card. If you're alright with not seeing a card every game, it's alright to put two or three.
Some deck suggestions I have if you want to build something pretty good in the current set:
1. Mardu Knights - Black, White, Red.
2. Izzet Card Draw - Blue, Red.
Both are pretty easy to build and if you're only playing casual with friends, they should do pretty well for the time being.